Stock-Based Compensation - Summary of Stock Option Activity under Company's Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Oct. 31, 2020	Oct. 31, 2019
Service Based Restricted Shares and Restricted Stock Units [Line Items]
Time-Based RSUs, Vested in Period, Fair Value	$ 5,844	$ 8,708
Performance Based Restricted Shares and Restricted Stock Units [Member] [Member]
Service Based Restricted Shares and Restricted Stock Units [Line Items]
Outstanding at July 31, 2020	126,060
Outstanding at July 31, 2020, Weighted Average Grant Date Fair Value	$ 50.61
Service-Based RSUs, Grants in Period	64,634
Service-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value	$ 60.73
Service-Based RSUs, Vested in Period	(71,413)
Service-Based RSUs, Vested in Period, Weighted Average Grant Date Fair Value	$ 33.12
Service-Based RSUs, Forfeited in Period	0
Service-Based RSUs, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Outstanding at October 31, 2020	119,281
Outstanding at October 31, 2020, Weighted Average Grant Date Fair Value	$ 61.05
Service Based Restricted Shares and Restricted Stock Units [Member]
Service Based Restricted Shares and Restricted Stock Units [Line Items]
Outstanding at July 31, 2020	154,960
Outstanding at July 31, 2020, Weighted Average Grant Date Fair Value	$ 47.39
Service-Based RSUs, Grants in Period	75,352
Service-Based RSUs, Grants in Period, Weighted Average Grant Date Fair Value	$ 39.92
Service-Based RSUs, Vested in Period	(63,339)
Service-Based RSUs, Vested in Period, Weighted Average Grant Date Fair Value	$ 44.85
Service-Based RSUs, Forfeited in Period	0
Service-Based RSUs, Forfeitures, Weighted Average Grant Date Fair Value	$ 0
Outstanding at October 31, 2020	166,973
Outstanding at October 31, 2020, Weighted Average Grant Date Fair Value	$ 44.98

[Line Items] for Service Based Restricted Shares and Restricted Stock Units [Table]

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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